I am lost in the end.

I was in a stronghold collecting bricks around an end portal and I accidently jumped through it, and I want to get out with out dying. I know this is possible because people sell endstone. Please help because I don't want to lose my stuff.

There is always an exit portal in the end, it is usually found at surface level, and looks like a fountain sortof, just jump through it to to back to town. You can press escape to skip all the end game credits.

No worries, it is a little daunting at first no having any visible sign to get back to town, but the end is not a scary place as long as you don't let your cursor hover on any endermen longer then a microsecond, otherwise they will attack you for 'looking' at them.